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i think it will be light-hearted since if it grimdark like madoka, people will say it "just Madoka with different character" or "why don't make a spin-off in Madoka world like Oriko and Kazumi if it dark" and it won't stand out. SHAFT is famous for being unique with their anime so i don't think they gonna make a madoka-like anime here

No.
There have been plenty of darker takes on magical girl anime over the years; I liked Madoka quite a lot, but it is neither unique, special, nor genre-redefining.
Furthermore, given that it's only been a year and a half, I think it is far, far too early to say anything about its impact upon the medium.

Anyway, Prism Nana looks really standard, but if it ends up being something like Nanoha, I guess I'll be happy.

Also, as much as I adore Watchmen, it wasn't the trailblazer of dark-superhero comics - merely arguably the finest example.